Reactor terminology: when is a reactor commonly termed an autoclave?

Introduction / Context:
The term autoclave is widely used in laboratory and pilot plants, yet its precise meaning is sometimes blurred. Proper terminology helps avoid safety and design misunderstandings.

Given Data / Assumptions:

• Batch operation, pressure vessel with closure.
• Capability to operate above atmospheric pressure and often at elevated temperature.
• Materials and seals selected for pressure service.

Concept / Approach:
An autoclave is a sealed high pressure batch reactor or sterilizer. It is not a tubular reactor and not limited to atmospheric service. Pressure ratings and code compliance (e.g., ASME) distinguish it from ordinary open tanks.

Step-by-Step Solution:
Identify batch mode with a pressure tight closure.Note pressure and temperature design beyond ambient conditions.Conclude that the standard usage corresponds to a high pressure batch reactor.

Verification / Alternative check:
Vendor catalogs and standards describe autoclaves as bench top or floor mounted pressure vessels for reactions, polymerizations, hydrothermal synthesis, or sterilization cycles.

Why Other Options Are Wrong:
Atmospheric tank or CSTR is not an autoclave; a high pressure tubular reactor is a different configuration (plug flow), not typically labeled autoclave.

Common Pitfalls:
Assuming every sealed vessel is an autoclave; the term implies pressure rated batch service, not merely a closed lid.

Final Answer:
When it is a high pressure batch reactor